ABBREVIATIONS
D30 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL iii
PTP Precision Time Protocol
pu Per Unit
PUIB Pickup Current Block
PUIT Pickup Current Trip
PUSHBTN Pushbutton
PUTT Permissive Under-reaching Transfer Trip
PWM Pulse Width Modulated
PWR Power
QUAD Quadrilateral
RRate, Reverse
RA Registration Authority
RCA Reach Characteristic Angle
REF Reference
REM Remote
REV Reverse
R-GOOSE Routable GOOSE
RI Reclose Initiate
RIP Reclose In Progress
RGT BLD Right Blinder
RMA Return Materials Authorization
RMS Root Mean Square
ROCOF Rate of Change of Frequency
ROD Remote Open Detector
RRTD Remote Resistance Temperature Detector
RST Reset
RSTR Restrained
RTD Resistance Temperature Detector
RTU Remote Terminal Unit
RX (Rx) Receive, Receiver
ssecond
SSensitive
SAT CT Saturation
SBO Select Before Operate
SCADA Supervisory Control and Data Acquisition
SCC Serial Communication Controller
SCD System Configuration Description
SCL Substation Configuration Language
SCEP Simple Certificate Enrollment Protocol
SEC Secondary
SEL Select / Selector / Selection
SENS Sensitive
SEQ Sequence
SFTP Secure Shell (SSH) File Transfer Protocol, Secure
File Transfer Protocol
SIR Source Impedance Ratio
SNTP Simple Network Time Protocol
SRC Source
SSB Single Side Band
SSEL Session Selector
STATS Statistics
SUPN Supervision
SUPV Supervise / Supervision
SV Supervision, Service
SYNC Synchrocheck
SYNCHCHK Synchrocheck
TTime, transformer
TC Thermal Capacity
TCP Transmission Control Protocol
TCU Thermal Capacity Used
TD MULT Time Dial Multiplier
TEMP Temperature
TFTP Trivial File Transfer Protocol
THD Total Harmonic Distortion
TMR Timer
TOC Time Overcurrent
TOV Time Overvoltage
TRANS Transient
TRANSF Transfer
TSEL Transport Selector
TUC Time Undercurrent
TUV Time Undervoltage
TX (Tx) Transmit, Transmitter
UUnder
UC Undercurrent
UCA Utility Communications Architecture
UDP User Datagram Protocol
UL Underwriters Laboratories
UNBAL Unbalance
UR Universal Relay
URC Universal Recloser Control
.URS Filename extension for settings files
UV Undervoltage
V/Hz Volts per hertz
V_0 Zero Sequence voltage
V_1 Positive Sequence voltage
V_2 Negative Sequence voltage
VA Phase A voltage
VAB Phase A to B voltage
VAG Phase A to Ground voltage
VARH Var-hour voltage
VB Phase B voltage
VBA Phase B to A voltage
VBG Phase B to Ground voltage
VC Phase C voltage
VCA Phase C to A voltage
VCG Phase C to Ground voltage
VF Variable Frequency
VIBR Vibration
VT Voltage Transformer
VTFF Voltage Transformer Fuse Failure
VTLOS Voltage Transformer Loss Of Signal
WDG Winding
WH Watt-hour
w/ opt With Option
WGS World Geodetic System
WRT With Respect To
XReactance
XDUCER Transducer
XFMR Transformer
Z Impedance, Zone